2000 Ford Windstar Running lean?

The check engine light came on. I hooked up my OBD 2 up to it. It said it was lean on both bank 1 & bank 2. I'm assuming by bank it means both fuel injector rails? Van runs fine when I clear the code, but within 150 miles, (sometimes less) the check engine light comes back on again. Saying the same thing. Banks 1 & 2 are lean. Any suggestions as to what I can do to fix this problem? I have noticed that it's not getting the gas mileage it should be getting.

Also, the radio stays on when I shut the van off. I make sure all the electrical stuff is in the off position when I shut the van off, or over a couple of days the battery gets drained.

* Dirty fuel injectors. (Try cleaning the injectors)

* Leaky EGR valve. (Check operation of EGR valve)

* Leaky PCV Valve or hose. (Check valve and hose connections)

* Dirty or defective Mass Airflow Sensor (MAF). (Try cleaning the MAF sensor wires or filament with aerosol electronics cleaner. Do NOT use anything else to clean the sensor, and do not touch the sensor wires)

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Monday, February 16th, 2009 AT 12:40 AM

DADDY CANE

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Running lean "bank 1" is your O2 sensor

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Tuesday, July 28th, 2009 AT 3:45 PM

JIS001

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Sorry to say this but daddy cane is way off? Especially if this is a 3.8L engine. There is a tech bulletin for this condition.

This TSB supersedes articles 03-4-7 and 00-21-8.

ACTION
Do not replace PCM (Powertrain Control Module), MAF (Mass Air Flow), or HEGOs (Heated Oxygen Sensors), as these parts are not the root cause of the lean codes conditions described. Refer to following Service Procedure for details.

SERVICE PROCEDURE

These conditions may be caused by a loose fitting on the fuel pressure regulator vacuum line on the intake manifold end and/or leaking isolator bolts/port gaskets in the lower to upper intake manifold mounting area. This condition is sometimes intermittent and may not be apparent on a warmed-up engine.

If the vacuum line from the intake manifold to the fuel pressure regulator is loose at the manifold (due to oil contamination), replace the vacuum line (9E498) and install a new design LH service valve cover (6582). Another vacuum leak source is the gasket (9H486) between the upper and lower intake manifold assemblies caused by a loss of tension at the isolator bolt assemblies (9S479) due to contamination of the rubber grommets from excessive oil pullover.

1. Perform self test, if codes P0171, P0174 are the only codes stored in the PCM then continue with this article. For any other codes, follow the normal diagnostic procedures found in the PC/ED Manual.